Across
- 3. Immunity that develops after a person is infected with a specific pathogen
- 4. Immune system cells that circulate in the blood to help fight infection
- 5. The ability of an organism to resist a particular infection
- 7. An organism that can cause disease
- 8. Milky fluid that carries immune cells through the lymphatic system
- 9. Can only reproduce in the cells of a living thing, can cause disease
- 10. A protein produced by the body's immune system when it detects antigens
Down
- 1. The immune protection a person is born with
- 2. A type of living unicellular microorganism, some can cause disease
- 3. A foreign substance which induces an immune response in the body
- 6. A complex system of cells and proteins that defend the body against infection